642525241 has 2 divisors, whose sum is σ = 642525242. Its totient is φ = 642525240.

The previous prime is 642525209. The next prime is 642525253. The reversal of 642525241 is 142525246.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 521437225 + 121088016 = 22835^2 + 11004^2 .

It is a cyclic number.

It is not a de Polignac number, because 642525241 - 2⁵ = 642525209 is a prime.

It is not a weakly prime, because it can be changed into another prime (642525041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321262620 + 321262621.

It is an arithmetic number, because the mean of its divisors is an integer number (321262621).

Almost surely, 2^642525241 is an apocalyptic number.

It is an amenable number.

642525241 is a deficient number, since it is larger than the sum of its proper divisors (1).

642525241 is an equidigital number, since it uses as much as digits as its factorization.

642525241 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19200, while the sum is 31.

The square root of 642525241 is about 25348.0816039400. The cubic root of 642525241 is about 862.9058191360.

The spelling of 642525241 in words is "six hundred forty-two million, five hundred twenty-five thousand, two hundred forty-one".